<!DOCTYPE html>
<html lang="zh_CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <title>Title</title>
  <script type="text/javascript">
    function getUserIP(onNewIP) { //  onNewIp - your listener function for new IPs
      //compatibility for firefox and chrome
      var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
      var pc = new myPeerConnection({
          iceServers: []
        }),
        noop = function() {},
        localIPs = {},
        ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g,
        key;

      function iterateIP(ip) {
        console.log(ip);
        if (!localIPs[ip]) onNewIP(ip);
        localIPs[ip] = true;
      }

      //create a bogus data channel
      pc.createDataChannel("");

      // create offer and set local description
      pc.createOffer().then(function(sdp) {
        sdp.sdp.split('\n').forEach(function(line) {
          if (line.indexOf('candidate') < 0) return;
          line.match(ipRegex).forEach(iterateIP);
        });

        pc.setLocalDescription(sdp, noop, noop);
      }).catch(function(reason) {
        // An error occurred, so handle the failure to connect
      });

      //sten for candidate events
      pc.onicecandidate = function(ice) {
        if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return;
        ice.candidate.candidate.match(ipRegex).forEach(iterateIP);
      };
    }

    // Usage

    getUserIP(function(ip){
      console.log("Got IP! :" + ip);
    });

  </script>
</head>
<body>

</body>
</html>
